Add ligature plugins, installation instructions

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+# Ligatures and Unicode substitution
+
+These features are supported *in vim only*.
+
+### Installation
+
+Symlink the required vim plugins to
+
+ - `~/.vim/after/syntax/` (vim)
+ - `~/.config/nvim/after/syntax/` (neovim)
+
+ ```shell
+ #vim
+ cd ~/scientifica/ligature_plugins/
+ for i in `ls *.vim`; do
+ ln -sf ~/scientifica/ligature_plugins/"$i" ~/.vim/after/syntax/"$i"
+ done
+
+ #nvim
+ cd ~/scientifica/ligature_plugins/
+ for i in `ls *.vim`; do
+ ln -sf ~/scientifica/ligature_plugins/"$i" ~/.config/nvim/after/syntax/"$i"
+ done
+ ```
+
+Haskell in vim with scientifica:
+![haskell_ligs](https://0x0.st/sT8a.png)
+
+Credits go to [romeovs](https://github.com/romeovs/) for the haskell plugin.  
+Credits go to [ehamberg](https://github.com/ehamberg/vim-cute-python) for the python plugin.
+
+Both plugins have been modified (haskell.vim especially) to play well with scientifica.  
+If you need ligatures for other languages, just open an issue, with the language and the ligature sequence.